Spon, J. S. d. History of the Barons de Spon, Comtes zu Forbach, and allied families (1978) (Lithogr.). Priv. produced.
Citazione stile Chigago Style (17a edizione)Spon, John Seymour de. History of the Barons De Spon, Comtes Zu Forbach, and Allied Families (1978). Lithogr. London: Priv. produced.
Citatione MLA (8a ed.)Spon, John Seymour de. History of the Barons De Spon, Comtes Zu Forbach, and Allied Families (1978). Lithogr. Priv. produced.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.